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A micro integrated low-power pulse laser electro-optic Q-switching circuit is developed in this paper, which can be used in the environment of - 40 ℃ ~ + 85 ℃, and is suitable for the ultra-small unmanned ranging and irradiation platform. The circuit integrates high voltage power supply and high voltage switch, which overcomes the disadvantages of the traditional electro-optic Q-switching circuit, such as complex driving, high power consumption, edge jitter, low reliability and large volume. The experimental results show that the power consumption of the designed electro-optic Q-switch circuit is less than 2W, the high voltage of Q-switch is adjustable in the range of 1-5kv, and the rising or falling edge of pulse is less than 25ns. It can be triggered by TTL control signal directly, and the trigger frequency can reach 1kHz. It is suitable for many electro-optic Q-switch crystals, easy to integrate and use, and can provide reliable electro-optic Q-switch circuit for high repetition rate and high peak power pulse laser. In addition, our designed circuit has been applied in many military projects.